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Topic: Bren Gas tube wear (Read 1130 times)

I searched for this issue, but did not see it mentioned. I bought a Bren 805 rifle from Buds Gun shop a few months ago. After 90rds I couldn't shoot it anymore due to the excessive gas and metal debris flying back at my face. I took it home and noticed the gas tube hole had enlarged and what appeared to be very bad pitting/deep holes all around the gas tube hole.

I called and emailed CZ, and they assured me that it was normal wear. I ended up sending it in and after 6 weeks, received a letter stating it was normal and to try different ammo.

I loaded up some other ammo in 10rd increments and got thrpugh 30rds before calling it quits. I had 2 small holes in my cheek from metal fragments and an even worse looking gas tube. There was quite a lot of copper shavings in the gas system.

CZ denies there is a problem, and the rifle os currently at their warranty dept once again.

The only thing I can think of is a barrel burr, or gas port to large? Some others have reported the same issue, and they have also not had any resolution from CZ. Anyone else seeing this?

Here is my gas tube after 900 rounds. Lots of wear and CZ say that it is normal. Measured the orifice in the barrel, .110 which seem large when the ports in the gas tube are .043 and .048. Lets hope these are not US made barrels. I got this gun from Buds.

interesting - two members with one post each complaining about the same issue. Interesting.I don't really have any idea how many rounds mine has been through, several thousand by now, with almost no discernible wear. I haven't done a real detailed look at the gas port, but I will try as soon as I get some time. I will say my rifle has been 100% perfect.

You guys came together? Welcome to the Forum, and we have some fairly knowledgeable people here. Starting off your post - if after 90 round my rifle's gas port had expanded to the point that I had actual metal debris coming back into my face, I would have done the same thing. You mention copper shavings in the gas system - is there a small "lip" in the barrel from the gas port scraping off passing bullets? Mine shoots cast bullets without depositing lead in the gas tube, so that might be something I'd be concerned about.Yours is the first I've heard of in several years, please keep us advised what CZ says. I might also look for another barrel - the rifle is just too darn good to throw away if you can get it running right.

Looked at that post from 2015, his erosion at 10,000 rounds is way less than mine at 900. Something has changed in either the barrel or gas tube. I wonder if some of you 805 owners could measure the orifice in the barrel, a 7/64 drill bit, .1093, will drop right in on mine with maybe a couple of thousands clearance. That .110 - .112 orifice seems large for a .223 and is causing jacket material to get blown through the gas system. By the way I've been a longtime lurker here. My CZ'S are a kadet, 83, 75 compact,527 in 7.62/39 and a CSA vz 58. I'm still liking my bren, if this is normal erosion I'll live with it. I bought a spare gas tube over the black friday sale, 20% off of the segular price of 80.00. missed one an American 452.

Actually, that's good customer service, one where they may think the customer just doesn't have a good fit for the product, and by offering a full refund for what is a used product they assume the fault, and try to make the customer happy. What you MIGHHT ask is if you get a refund, can you get a different BREN and try again - I have had no issues with mine whatsoever, and haven't been hit in the face by anything.